Abstract
AbstractA moderately diverse assemblage of micromorphic linguliform brachiopods, including Tapuritreta gribovensis sp. nov., Wahwahlingula? pankovensis sp. nov., Acrothele sp., Anabolotreta? sp., Orbithele? sp. and Stilpnotreta sp., is for the first time described from the Cambrian Karpinsk Formation (Miaolingian, Guzhangian) of the South Island of Novaya Zemlya. The morphology of the metamorphic shell in Acrothele and Wahwahlingula? suggest that both taxa had a single pair of larval setal sacs, similar to the recent discinids, but their metamorphosis was completed only at the end of the pelagic stage and shows that they did have direct development, which is characteristic of all recent lingulides. The biogeographical signature of the new Cambrian brachiopod fauna from Novaya Zemlya is discussed, and the new fauna gives new information on the poorly known Cambrian margins of the Baltica palaeocontinent.
Highlights
GEOLOGICAL AND GEOGRAPHICAL SETTINGThe Cambrian deposits exposed along the west coast of Novaya Zemlya are presently subdivided into: (1) the Astafiyev Formation (unnamed Cambrian Stage 4–Wuliuan); (2) the Snezhnyye Gory Formation (upper Wuliuan – lower Guzhangian); and (3) the Karpinsk Formation (upper Guzhangian – Jiangshanian; Fig. 2)
A moderately diverse assemblage of micromorphic linguliform brachiopods, including Tapuritreta gribovensis sp. nov., Wahwahlingula? pankovensis sp. nov., Acrothele sp., Anabolotreta? sp., Orbithele? sp. and Stilpnotreta sp., is for the first time described from the Cambrian Karpinsk Formation (Miaolingian, Guzhangian) of the South Island of Novaya Zemlya
THE first evidence of Cambrian deposits on the South Island of Novaya Zemlya was obtained by a Norwegian expedition in 1921 (Holtedahl 1922)
Summary
The Cambrian deposits exposed along the west coast of Novaya Zemlya are presently subdivided into: (1) the Astafiyev Formation (unnamed Cambrian Stage 4–Wuliuan); (2) the Snezhnyye Gory Formation (upper Wuliuan – lower Guzhangian); and (3) the Karpinsk Formation (upper Guzhangian – Jiangshanian; Fig. 2). At the section of the Gribovaya Bay south coast, the Mendeleev Series contains several species of Protagraulos, including P. priscus Matthew, 1895 in the lowermost part, suggesting Cambrian Stage 4 (Solovyev et al 1986). The Karpinsk Formation (upper Guzhangian – Jiangshanian) is presently known only from the South Island, where it is exposed between the Bezymyannaya Bay area in the south and the Matochkin Shar Strait in the north (Solovyev et al 1986) It rests conformably, or possibly with a slight disconformity, on the Snezhnyye Gory Formation. The trilobite assemblage from Holtedahl’s locality 68b, documented by Walcott & Resser (1924) contains Irvingella septentrionalis Walcott & Resser, 1924, which, according to Palmer (1965), is the junior synonym of Irvingella major Ulrich & Resser in Walcott, 1924 The latter occurrence suggests a Jiangshanian age for the uppermost Karpinsk Formation. Total four ventral and 11 dorsal valves; all from locality 302/3
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